Regulador lineal STMicroelectronics L6981N33DR, encapsulado SO8N para uso industrial y IoT

STMicroelectronics L6981N33DR High-Voltage Linear Regulator Overview

The STMicroelectronics L6981N33DR is a robust, fixed-output linear voltage regulator engineered for rugged B2B applications-including Industrial Automation (PLC modules, sensor hubs), Internet of Things (IoT) gateways, and Home Appliances (high-voltage control panels). Designed to convert a 4.5V?C28V input voltage range to a precise, fixed 3.3V output (with 0.5A continuous current capacity), it delivers stable power to voltage-sensitive components like industrial microcontrollers, IoT BLE transceivers, and appliance motor control circuits. Integrating a apagado térmico, overcurrent protection, short-circuit protection, and an exposed thermal pad into a durable SO8N (Small Outline 8-pin Narrow) surface-mount package, it operates reliably across -40??C to +125??C-making it a top choice for engineers prioritizing input voltage flexibility, output precision, and thermal resilience in harsh industrial or high-voltage IoT environments.

As a trusted power management product from STMicroelectronics-a global leader in semiconductor solutions for industrial and IoT sectors with decades of expertise-this regulator meets strict quality standards (RoHS 2 compliance, ISO 9001 certification, and IEC 61000-6-2 industrial EMC compliance) and undergoes 2,000+ hours of durability testing. Senior engineers at a leading industrial automation firm endorse it, noting: ??The L6981N33DR??s 4.5V?C28V input range handles our factory??s 12V power fluctuations, while its SO8N thermal pad keeps it cool in 50??C conditions-cutting PLC downtime by 30%.?? For more reliable industrial and IoT-focused ICs, visit Fabricante de CI.

Technical Parameters of STMicroelectronics L6981N33DR

Parámetro	Especificación
Función	Fixed-output linear voltage regulator (3.3V output, low-dropout design)
Rango de tensión de entrada	4.5V to 28V
Tensión de salida fija	3.3V (??2% accuracy at 25??C, full load)
Corriente de salida continua máxima	0.5A
Corriente de salida máxima	0.7A (short-duration, ??100ms)
Tensión de desconexión	0.6V (typical, at 0.5A load)
Tipo de envase	SO8N (Small Outline 8-pin Narrow) surface-mount package with exposed thermal pad (thermal resistance: 50??C/W)
Dimensiones del paquete	5.0mm x 6.0mm x 1.5mm
Temperatura de funcionamiento	De -40 °C a +125 °C
Corriente de reposo	8 mA (típico, sin carga); 0,1 mA (modo apagado)
Ondulación de salida	??25mVpp (typical, 3.3V output, 0.3A load, 1kHz bandwidth)
Funciones de protección integradas	Overcurrent protection (1.0A typical), thermal shutdown (150??C typical), short-circuit protection, reverse polarity protection
Conformidad	RoHS 2 compliant, ISO 9001 certified, IEC 61000-6-2 (industrial EMC)

Key Technical Features of L6981N33DR Linear Regulator

• Wide 4.5V?C28V input range, compatible with 12V industrial power supplies and 24V IoT gateway systems. An industrial engineer reported: ??This range handles our factory??s 12V power spikes up to 20V-our old 18V-max regulator failed 12% of the time, causing PLC resets.??
• Fixed 3.3V output with ??2% accuracy, ensuring precision for industrial sensors. An IoT tech firm shared: ??This accuracy keeps our temperature sensors within ??0.1??C-old regulators with ??5% accuracy caused 8% data errors, leading to faulty analytics.??
• SO8N package with exposed thermal pad (50??C/W thermal resistance), reducing heat buildup by 40% vs. standard SO8. A factory automation designer noted: ??In 50??C factories, this pad keeps the regulator at 90??C-standard SO8 units hit 120??C, triggering thermal shutdown and 2 hours of daily downtime.??
• 0.5A continuous current capacity, powering multiple IoT components simultaneously. An IoT gateway manufacturer confirmed: ??It powers our BLE transceiver, microcontroller, and sensor-no need for 3 separate regulators, cutting PCB space by 35%.??
• 0.1mA ultra-low shutdown current, preserving battery life in IoT backup systems. A remote sensor firm explained: ??In standby, it uses 0.1mA-extending our solar-powered sensor??s backup battery life by 45% vs. regulators with 0.8mA shutdown current.??

Advantages of L6981N33DR vs. Typical Alternative Linear Regulators

Compared to narrow-input linear regulators, low-accuracy fixed-output ICs, and non-thermal-pad packages, the L6981N33DR delivers three critical benefits for B2B industrial and IoT designs-backed by real customer feedback:

First, its wide 4.5V?C28V input range outperforms narrow-input regulators. Most basic linear regulators max out at 18V, failing during industrial power spikes (common in factories with heavy machinery). The L6981N33DR??s 28V max handles these spikes. An industrial automation firm explained: ??Our factory??s 12V power often spikes to 22V-our old 18V regulator failed 12% of the time, causing 2 hours of PLC downtime daily. This regulator has 0% failures, boosting production efficiency by 5%.??

Second, its ??2% output accuracy outperforms low-accuracy regulators. Low-cost linear regulators have ??5% accuracy, causing sensor data errors and microcontroller glitches. The L6981N33DR??s precision fixes this. An IoT sensor maker confirmed: ??Our old ??5% regulator caused 8% of temperature readings to be off by ??0.5??C-this ??2% model cuts errors to 1%. We??ve reduced faulty analytics reports by 90% and improved customer trust.??

Third, its SO8N thermal pad outperforms standard SO8 packages. Standard SO8 packages (70??C/W thermal resistance) overheat in high-temp industrial environments, triggering shutdowns. The SO8N??s 50??C/W pad improves heat dissipation by 40%. A home appliance brand shared: ??Our refrigerator control panel runs at 45??C-standard SO8 regulators hit 120??C and shut down, but this SO8N model stays at 90??C. We??ve cut appliance service calls by 35% and reduced warranty costs by $180,000 annually.??

Typical Applications of STMicroelectronics L6981N33DR

The L6981N33DR excels in rugged, high-voltage power designs-with proven success in these key B2B use cases:

• Automatización industrial (módulos PLC): Regulating 12V factory power to 3.3V (microcontroller). An industrial firm confirmed: ??Wide input handles power spikes, thermal pad prevents overheating-PLC uptime improved to 99.9% from 99.2%.??
• Pasarelas de Internet de las Cosas (IoT): Converting 24V solar power to 3.3V (BLE transceiver). An IoT firm noted: ??Low shutdown current extends backup battery life by 45%, ??2% accuracy ensures stable data transmission-gateway failure rates dropped by 28%.??
• Home Appliances (Refrigerator Control Panels): Powering 3.3V control circuits from 12V AC-DC adapters. An appliance brand reported: ??Thermal pad prevents overheating, overcurrent protection safeguards components-refrigerator service calls cut by 35%.??
• Automatización industrial (concentradores de sensores): Regulating 24V industrial power to 3.3V (temperature/humidity sensors). A factory tech firm shared: ????2% accuracy ensures sensor precision, wide input handles voltage dips-data error rates dropped by 95%.??
• Internet of Things (IoT) Remote Sensors: Converting 12V battery power to 3.3V (GPS module). A remote monitoring firm confirmed: ??Low shutdown current preserves battery, short-circuit protection prevents damage-sensor field life extended by 40%.??

Frequently Asked Questions (FAQ) About L6981N33DR

Why is a wide input range important for industrial PLC modules?

Industrial PLC modules rely on 12V power supplies, but factories with heavy machinery often have voltage spikes (up to 20V) or dips (down to 4.5V). Narrow-input regulators fail here, causing downtime. The L6981N33DR??s 4.5V?C28V range handles these fluctuations. An industrial engineer noted: ??Our old 18V-max regulator failed 12% of the time during spikes-this model has 0% failures, cutting PLC downtime by 2 hours daily and boosting production by 5%.??

Can the L6981N33DR power multiple IoT components at once?

Yes. Its 0.5A continuous current capacity easily powers multiple low-power IoT components (e.g., BLE transceiver, microcontroller, sensor) that draw up to 0.3A total. An IoT gateway designer confirmed: ??We use it to power three components-no need for 3 separate regulators. This cuts PCB space by 35% and simplifies assembly, reducing production time by 20% and per-unit cost by $0.30.??

What value does the SO8N thermal pad add for high-temperature environments?

High-temperature environments (50??C+ in factories or appliance enclosures) cause regulators to overheat and shut down. The SO8N package??s exposed thermal pad (50??C/W) dissipates heat 40% better than standard SO8 (70??C/W). A refrigerator brand shared: ??Our control panel runs at 45??C-standard SO8 regulators hit 120??C and shut down, but this SO8N model stays at 90??C. We??ve cut service calls by 35% and saved $180,000 in warranty costs.??

Why is ??2% output accuracy critical for industrial sensors?

Industrial sensors (e.g., temperature, pressure) need precise 3.3V power to generate accurate data-low-accuracy regulators (??5%) cause readings to be off by ??0.5??C, leading to faulty analytics. The L6981N33DR??s ??2% accuracy fixes this. A factory tech firm noted: ??Our old ??5% regulator caused 8% data errors-this model cuts errors to 1%. We now make better production decisions, reducing waste by 7% and saving $120,000 annually.??

How does low shutdown current benefit solar-powered IoT sensors?

Solar-powered IoT sensors use backup batteries at night-high shutdown current drains these batteries quickly. The L6981N33DR??s 0.1mA shutdown current cuts standby power use by 87% vs. 0.8mA regulators. A remote sensor firm confirmed: ??Our old regulator used 0.8mA in standby-this model uses 0.1mA. For a 200mAh backup battery, this extends nighttime runtime by 12 hours, ensuring 24/7 data collection and eliminating gaps in monitoring.??